Reach

In the application of statistics to advertising and media analysis, reach is defined as the size of the audience who listen to, read, view or otherwise access a particular work in a given time period. Reach may be stated either as an absolute number, or as a fraction of a population.

For any given viewer, they have "reached" the work if they have viewed it at all during the specified time period. Multiple viewings by a single member of the audience in the cited time period do not increase reach.

Since reach is a time-dependent summary of aggregate audience behavior, reach figures are meaningless without a time period associated with them: an example of a valid reach figure would be to state that "[example website] had a one-day reach of 1565 per million on 21 March 2004".

Other uses

• Reach is also the name of the eGovernment agency of the government of Ireland.

• REACH is the Registration, Evaluation and Authorisation of CHemicals framework for regulation of chemicals in the European Union.

• REACH is also a brand of toothbrushes, dental floss, and other oral care products manufactured by McNeil-PPC, a division of Johnson & Johnson Corporation.

• In the video game series Halo, Reach is a planet in the Epsilon Eridani system. Reach is the UNSC's second military headquarters, and the site of the SPARTAN project which produced Master Chief.

• Reach is a village in Cambridgeshire, England.